GB2305054B - Blemish concealment in video signals - Google Patents

Blemish concealment in video signals

Info

Publication number
GB2305054B
GB2305054B GB9616212A GB9616212A GB2305054B GB 2305054 B GB2305054 B GB 2305054B GB 9616212 A GB9616212 A GB 9616212A GB 9616212 A GB9616212 A GB 9616212A GB 2305054 B GB2305054 B GB 2305054B
Authority
GB
United Kingdom
Prior art keywords
signal
blemish
side chain
selector switch
differences
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB9616212A
Other versions
GB9616212D0 (en
GB2305054A (en
GB2305054A8 (en
Inventor
Robert Edward May
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Broadcasting Corp
Original Assignee
British Broadcasting Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9517597.2A external-priority patent/GB9517597D0/en
Application filed by British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB9616212A priority Critical patent/GB2305054B/en
Priority to US08/700,307 priority patent/US5978047A/en
Priority to AT96202361T priority patent/ATE306786T1/en
Priority to DE69635259T priority patent/DE69635259T2/en
Priority to EP96202361A priority patent/EP0762740B1/en
Publication of GB9616212D0 publication Critical patent/GB9616212D0/en
Publication of GB2305054A publication Critical patent/GB2305054A/en
Publication of GB2305054A8 publication Critical patent/GB2305054A8/en
Publication of GB2305054B publication Critical patent/GB2305054B/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/213—Circuitry for suppressing or minimising impulsive noise

Abstract

A video signal 21 is input to a motion-compensated median filter to produce a preliminary blemish-concealed signal 23. The preliminary signal and the original input signal are passed via appropriate delays to respective inputs of a selector switch 31 and to a side chain circuit. The selector switch is controlled by the side chain circuit output and the selector switch output 22 forms a final blemish-concealed video signal. In the side chain circuit a difference signal C is generated to indicate differences between the input signal and the preliminary signal. The difference signal C is processed in two parallel circuit branches to remove differences having gently-sloping edges and differences corresponding to similar-sized differences in similar areas of adjacent frames, which are likely to be motion artifacts. The modified difference signals from each circuit branch are combined in an AND gate 95 to generate a control signal, which controls the selector switch 22 to output the original input signal except in image areas where the side chain processing indicates that a blemish is present. <IMAGE>
GB9616212A 1995-08-29 1996-07-31 Blemish concealment in video signals Expired - Fee Related GB2305054B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9616212A GB2305054B (en) 1995-08-29 1996-07-31 Blemish concealment in video signals
US08/700,307 US5978047A (en) 1995-08-29 1996-08-21 Blemish concealment in video signals
EP96202361A EP0762740B1 (en) 1995-08-29 1996-08-24 Blemish concealment in video signals
DE69635259T DE69635259T2 (en) 1995-08-29 1996-08-24 Masking of stains in video signals
AT96202361T ATE306786T1 (en) 1995-08-29 1996-08-24 COVERING STAINS IN VIDEO SIGNALS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9517597.2A GB9517597D0 (en) 1995-08-29 1995-08-29 Blemish concealment in video signals
GB9616212A GB2305054B (en) 1995-08-29 1996-07-31 Blemish concealment in video signals

Publications (4)

Publication Number Publication Date
GB9616212D0 GB9616212D0 (en) 1996-09-11
GB2305054A GB2305054A (en) 1997-03-26
GB2305054A8 GB2305054A8 (en) 1999-07-02
GB2305054B true GB2305054B (en) 2000-03-22

Family

ID=26307641

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9616212A Expired - Fee Related GB2305054B (en) 1995-08-29 1996-07-31 Blemish concealment in video signals

Country Status (5)

Country Link
US (1) US5978047A (en)
EP (1) EP0762740B1 (en)
AT (1) ATE306786T1 (en)
DE (1) DE69635259T2 (en)
GB (1) GB2305054B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583823B1 (en) * 1997-08-01 2003-06-24 Sony Corporation Methods, apparatuses, and mediums for repairing a pixel associated with motion-picture processes
JP3863294B2 (en) * 1998-07-02 2006-12-27 株式会社日立製作所 Noise reduction signal processing circuit and video display device
JP4255553B2 (en) * 1999-02-04 2009-04-15 パナソニック株式会社 Imaging device
GB2361133B (en) 2000-04-07 2004-04-14 Snell & Wilcox Ltd Video signal processing
DE10033420A1 (en) * 2000-07-08 2002-01-17 Philips Corp Intellectual Pty Device for reducing flicker interference
US7119774B2 (en) * 2001-03-09 2006-10-10 Thomson Licensing Reducing sparkle artifacts with low brightness filtering
US7071909B2 (en) * 2001-03-09 2006-07-04 Thomson Licensing Reducing sparkle artifacts with low brightness processing
US20020126079A1 (en) * 2001-03-09 2002-09-12 Willis Donald Henry Reducing sparkle artifacts with low brightness slew rate limiting
US6985174B1 (en) * 2001-10-30 2006-01-10 Logitech Europe S.A. Dynamic radio frequency interference detection and correction
US6885706B2 (en) * 2002-01-05 2005-04-26 Aiptek International Inc. Method for promoting temporal resolution of sequential images
JP4194029B2 (en) * 2003-02-26 2008-12-10 Ｋｄｄｉ株式会社 Automatic image degradation detection device
CN111681241A (en) * 2020-08-12 2020-09-18 杭州百子尖科技股份有限公司 Quality control method and system based on machine vision detection and measurement depth integration

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1409153A (en) * 1973-04-19 1975-10-08 British Broadcasting Corp Telecine apparatus
GB1547811A (en) * 1977-04-27 1979-06-27 British Broadcasting Corp Telecine machines
EP0101180B1 (en) * 1982-07-16 1988-10-05 British Broadcasting Corporation Concealment of defects in a video signal
GB2139039B (en) * 1983-03-11 1986-09-03 British Broadcasting Corp Electronically detecting the presence of film dirt
US4590520A (en) * 1983-11-28 1986-05-20 Ball Corporation Method and apparatus for detecting and filling-in dead spots of video signals from an image sensor
GB2202706B (en) * 1987-03-27 1991-01-09 British Broadcasting Corp Video signal processing
JP2956016B2 (en) * 1990-05-24 1999-10-04 日本放送協会 Motion adaptive noise eliminator
DE4343095C2 (en) * 1993-12-17 2001-04-26 Philips Corp Intellectual Pty Method and circuit for eliminating interference signals from video signals

Also Published As

Publication number Publication date
EP0762740A2 (en) 1997-03-12
EP0762740B1 (en) 2005-10-12
GB9616212D0 (en) 1996-09-11
DE69635259T2 (en) 2006-07-06
EP0762740A3 (en) 1998-10-21
DE69635259D1 (en) 2005-11-17
US5978047A (en) 1999-11-02
GB2305054A (en) 1997-03-26
ATE306786T1 (en) 2005-10-15
GB2305054A8 (en) 1999-07-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140731